Crystal structure of aeromonas jandaei L-allo-threonine aldolase

Experimental Data Snapshot

  • Resolution: 2.60 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.235 

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L-allo-Threonine aldolase with an H128Y/S292R mutation from Aeromonas jandaei DK-39 reveals the structural basis of changes in substrate stereoselectivity.

Qin, H.M.Imai, F.L.Miyakawa, T.Kataoka, M.Kitamura, N.Urano, N.Mori, K.Kawabata, H.Okai, M.Ohtsuka, J.Hou, F.Nagata, K.Shimizu, S.Tanokura, M.

(2014) Acta Crystallogr D Biol Crystallogr 70: 1695-1703

  • DOI: https://doi.org/10.1107/S1399004714007664
  • Primary Citation of Related Structures:  
    3WGB, 3WGC

  • PubMed Abstract: 

    L-allo-Threonine aldolase (LATA), a pyridoxal-5'-phosphate-dependent enzyme from Aeromonas jandaei DK-39, stereospecifically catalyzes the reversible interconversion of L-allo-threonine to glycine and acetaldehyde. Here, the crystal structures of LATA and its mutant LATA_H128Y/S292R were determined at 2.59 and 2.50 Å resolution, respectively. Their structures implied that conformational changes in the loop consisting of residues Ala123-Pro131, where His128 moved 4.2 Å outwards from the active site on mutation to a tyrosine residue, regulate the substrate specificity for L-allo-threonine versus L-threonine. Saturation mutagenesis of His128 led to diverse stereoselectivity towards L-allo-threonine and L-threonine. Moreover, the H128Y mutant showed the highest activity towards the two substrates, with an 8.4-fold increase towards L-threonine and a 2.0-fold increase towards L-allo-threonine compared with the wild-type enzyme. The crystal structures of LATA and its mutant LATA_H128Y/S292R reported here will provide further insights into the regulation of the stereoselectivity of threonine aldolases targeted for the catalysis of L-allo-threonine/L-threonine synthesis.

  • Organizational Affiliation

    Division of Applied Life Sciences, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai 559-8531, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
L-allo-threonine aldolase
A, B, C, D
341Aeromonas jandaeiMutation(s): 0 
Gene Names: LATAltaA
Find proteins for O07051 (Aeromonas jandaei)
Explore O07051 
Go to UniProtKB:  O07051
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO07051
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.60 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.235 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 82.474α = 90
b = 95.85β = 113.64
c = 94.884γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-07-09
    Type: Initial release